<template>
  <!-- 底部部分 => list有数据的时候，才展示  list.length > 0 -->
  <footer v-if="list.length > 0" class="footer">
    <span class="todo-count"
      ><strong>{{ leftCounts }}</strong
      >剩余</span
    >
    <ul class="filters">
      <li>
        <a @click="filter('all')" :class="{selected: type==='all'}" href="#/">全部</a>
      </li>
      <li>
        <a @click="filter('active')" :class="{selected:type==='active'}" href="#/active">进行中</a>
      </li>
      <li>
        <a @click="filter('completed')" :class="{selected:type==='completed'}" href="#/completed">已完成</a>
      </li>
    </ul>
    <!-- 有已完成的任务，才需要显示这个按钮 -->
    <button v-if="isShowClear" @klick="clear" class="clear-completed">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  props: {
    list: {
      type: Array,
      required: true,
    },
  },
  data() {
    return {
      type: "all",
    };
  },
  computed: {
    leftCounts() {
      return this.list.filter((item) => item.flag === false).length;
    },
    isShowClear() {
      return this.list.some((item) => item.flag === true);
    },
  },
  methods: {
    clear() {
      this.$emit("clear");
    },
  },
  filters(){

  }
};
</script>

<style></style>
